US20140296384A1 - Corrosion, chip and fuel resistant coating composition - Google Patents

Corrosion, chip and fuel resistant coating composition Download PDF

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Publication number
US20140296384A1
US20140296384A1 US14/353,377 US201214353377A US2014296384A1 US 20140296384 A1 US20140296384 A1 US 20140296384A1 US 201214353377 A US201214353377 A US 201214353377A US 2014296384 A1 US2014296384 A1 US 2014296384A1
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composition
methacrylate
coating composition
present
coating
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Suparno Hazra
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3M Innovative Properties Co
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3M Innovative Properties Co
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Assigned to 3M INNOVATIVE PROPERTIES COMPANY reassignment 3M INNOVATIVE PROPERTIES COMPANY ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HAZRA, Suparno
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/08—Anti-corrosive paints
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D133/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
    • C09D133/04—Homopolymers or copolymers of esters
    • C09D133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
    • C09D133/08—Homopolymers or copolymers of acrylic acid esters
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D133/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
    • C09D133/04—Homopolymers or copolymers of esters
    • C09D133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
    • C09D133/10—Homopolymers or copolymers of methacrylic acid esters
    • C09D133/12—Homopolymers or copolymers of methyl methacrylate
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group

Definitions

  • the present invention relates to coating compositions comprising acrylate-epoxy hybrid chemistries. More particularly, the coating compositions of the present invention can form coating films that afford excellent corrosion resistance, chip resistance and fuel resistance. Further, such coating systems are facilitated at low coating thickness with enhanced damping performance, through a highly conformable single pack coating.
  • the coating composition of the present invention can adhere to primed or/and unprimed metal surfaces, is sprayable under wide ambient conditions and is curable in natural air drying conditions.
  • underbody of a vehicle is frequently subjected to water from the road surface. Also hard and abrasive particles of grit or similar matter, together with water, especially salty water, make for a very harsh environment. Underbody structural components are typically coated to provide a first line of defense against corrosion. It is common practice to provide a coating to the metallic underbody of an automobile to protect the underbody from attack by road salt, water, and impinging road debris which cause rust and corrosion of the automobile underbody. Thus, underbody coatings are critical to automobile aesthetics (particularly that related to cabin acoustics), durability, resistance to chemical or physical impact and cost.
  • underbody coatings having anti-corrosive, anti-abrasive and sound deadening properties are also well known in the prior art.
  • US20020038615 provides a composition comprising an emulsion or dispersion of asphalt in water and fillers, wherein the asphalt emulsion on the surface of the substrate is exposed to a source of heat so as to dry the composition on the substrate.
  • asphalt based products have no fuel resistance, low wear resistance and are also too sensitive to dirt cleaning solvents used in car garages when the car is serviced or repaired.
  • the underbody coating composition for automotives so designed by the present inventors afford superior fuel resistance, superior abrasion/chip resistance and corrosion resistance. Additionally, the composition described in the present invention can be quickly dried, particularly under ambient conditions itself with superior adhesion to vehicle underbody substrates.
  • the composition is designed to make available through a highly conformable single pack coating system a ready to use formula meeting varied market application practices.
  • An object of the present invention is to provide a unique automotive underbody coating composition which meets simultaneously the following requirements:
  • the coating composition of the instant invention is based on acrylate-epoxy hybrid chemistries.
  • the composition comprises acrylate polymer based fine particles varying between 10-50% by solids of the total formulation whose Tg (glass transition temperature) varies in the range of 45 to 100 degree centigrade and a modified epoxy resin wherein the epoxy resin percentage varies from 3-50% with respect to the total solution and having hydroxyl equivalent in the range of 600 to 800 and molecular weight of around 3000.
  • the automotive underbody coating composition comprises a combination of two different acrylic resins having similar chemical functionalities but varying in glass transition temperature and molecular weights, a modified epoxy resin, one or more driers, one or more fillers, a rheological modifier additive, wetting & dispersing additive, a curing agent, a corrosion inhibitor and UV inhibitor.
  • FIG. 1 Images of wear resistance
  • FIG. 2 Images of fuel resistance.
  • FIG. 3 Images of 1 mm cross hatch test.
  • FIG. 4 Impact test photos.
  • FIG. 5 Application photos.
  • FIG. 6 Pictoral representation of dissolution of coating in a competitor's test panel
  • a coating applied on a surface or substrate includes both coatings applied directly or indirectly to the surface or substrate.
  • a coating applied to a primer layer overlying a substrate constitutes a coating applied on the substrate.
  • the coating composition of the present invention may be applied to any type of metallic substrate, it is especially suited for use on preferably ferrous surfaces and will be described in connection therewith.
  • Corrosion is herein defined as an electrochemical process that seeks to reduce the binding energy in metals. It is a chemical or electrochemical reaction between a material, usually a metal, and its environment that produces a deterioration of the metal and its properties.
  • the process of corrosion is as an anodic reaction process, whereby metal-dissolving ions are generated.
  • the process occurring at the anodic site is the dissolution of metal as metallic ions, and converting these ions into insoluble corrosion products, such as rust.
  • the present composition is an acrylic resin based composition. Acrylics are known to have faster drying rates and superior mechanical strength compared to other single pack resin systems. In the present composition, two different acrylic resins having similar chemical functionality, but varying in the glass transition temperature and molecular weights are employed in this formulation.
  • the underbody coating composition of the present invention comprises a lower molecular weight Acrylic resin A, which constitutes one of the components with lower molecular weight of at least about 35,000g/mol and a glass transition temperature of at least 20° C.
  • the acrylic resin A is a combination of at least two alkyl(meth)acrylate monomers selected from the group comprising methyl methacrylate, n-butyl methacrylate, iso-butyl methacrylate, ethyl methacrylate, propyl methacrylate, hexyl methacrylate, ethylhexyl methacrylate, 2-ethylehexyl methacrylate, cyclohexyl methacrylate, other aliphatic methacrylates, and combinations thereof.
  • This thermoplastic resin is responsible for film formation at room temperature.
  • This lower molecular weight resin with lower Tg (glass transition temperature) imparts flexibility to the thermoplastic film. This affords better vibration damping.
  • the most preferred alkyl(meth)acrylate monomers for the combination that constitutes acrylic resin A includes, but is not limited to n-butyl methacrylate and methyl methacrylate combination.
  • alkyl methacrylate monomer combination is n-butyl methacrylate and methyl methacrylate.
  • n-butyl methacrylate and methyl methacrylate are disclosed below.
  • the acrylic resin A is present in an amount of from 1-40 weight percent, more preferably from 1-20 weight percent, and most preferably about 9 weight percent based on the total weight of the composition.
  • the underbody coating composition of the present invention comprises a higher molecular weight Acrylic resin B, which constitutes one of the components with lower molecular weight of at least about 60,000g/mol and a glass transition temperature of about 35° C. to 90° C., preferably, the glass transition temperature is in the range of 57° C.
  • the acrylic resin B is a combination of at least two alkyl(meth) acrylate monomers selected from the group comprising of methyl methacrylate, n-butyl methacrylate, iso-butyl methacrylate, ethyl methacrylate, propyl methacrylate, hexyl methacrylate, ethylhexyl methacrylate, 2-ethylehexyl methacrylate, cyclohexyl methacrylate, other aliphatic methacrylates, and combinations thereof.
  • This thermoplastic resin is responsible for high strength film formation because of higher molecular weight and also provides higher wear resistance required for the application.
  • the most preferred alkyl(meth) acrylate monomers for the combination that constitutes acrylic resin B includes, but is not limited to n-butyl methacrylate and methyl methacrylate combination.
  • the acrylic resin B is present in an amount of from 1-30 weight percent, more preferably from 1-20 weight percent, and most preferably about 16 weight percent based on the total weight of the composition.
  • Epoxy resins are generally described by the type of central organic moiety or moieties to which the 1, 2-epoxy moieties are attached.
  • Non-exclusive examples of such central moieties are those derived from bisphenol A, bisphenol F, novolak condensates of formaldehyde with phenol and substituted phenols, the condensates containing at least two aromatic nuclei; triazine; hydantoin; and other organic molecules containing at least two hydroxyl moieties each, in each instance with as many hydrogen atoms deleted from hydroxy moieties in the parent molecule as there are epoxy moieties in the molecules of epoxy resin.
  • the 1, 2-epoxy moieties may be separated from the central moieties as defined above by one or more, preferably only one methylene group. Oligomers of such monomers, either with themselves or with other organic molecules containing at least two hydroxyl moieties each, may also serve as the central organic moiety.
  • Non-exclusive examples of epoxy resins useful for the present invention include glycidyl ethers of a polyhydric phenol, such as bisphenol A (a particularly preferred species of polyhydric phenol), bisphenol F, bisphenol AD, catechol, resorcinol, and the like.
  • a polyhydric phenol such as bisphenol A (a particularly preferred species of polyhydric phenol), bisphenol F, bisphenol AD, catechol, resorcinol, and the like.
  • the acrylic resin A and B is employed in combination with an epoxy resin, which has been modified by cardanol obtained from CSNL (Cashew Nut Shell Liquid) resin to the ratio of 60:40.
  • CSNL Cosmetic Land Nut Shell Liquid
  • Cardanol is a presently preferred alkenyl-substituted phenol. Cardanol is a meta-substituted phenol derived from cashew nut shell liquid. A general structural representation of cardanol is as provided below
  • n is the number of carbon-carbon double bonds present in the alkenyl side chain and is typically 0,1,2 or 3.
  • the carbon-carbon double bonds may be conjugated or non-conjugated. It is contemplated that compounds having the above generalized structure may be employed to modify the epoxy resin.
  • the Epox resin has a molecular weight of 3000 and hydroxyl equivalent of about 720.
  • the Epox imparts excellent adhesion to metal because of the free hydroxyl groups, gives good flexibility to the system and provides superior chemical resistance.
  • the Epox resin is preferably an epoxy ether resin.
  • the composition comprises an additives selected from the group comprising a drier, dispersing agent, filler, rheological modifier additive and solvent.
  • Drier combination is used to accelerate the conversion of coating from liquid form to dry film.
  • drier herein is meant a siccative, that is by “drier” is meant any metal salts of higher aliphatic acids having from 8 to 30 carbon atoms or of naphthanic acids that primarily behave as an oxidation catalyst.
  • Driers are heavy metal soaps of organic acids. Examples of the polyvalent metal include calcium, cobalt, copper, manganese, lead, iron, vanadium and the like.
  • Non-limiting examples of preferred drier combinations are selected from the groups comprising cobalt naphthanate, calcium naphthanate, nickel naphthanate, manganese naphthanate, nickel octoate, cobalt octoate, zirconium octoate or combinations thereof.
  • Some of the most preferred drier combinations employed in context of the present invention are selected from the group comprising:
  • the drier combination is present in the composition of the present invention in an amount of upto 5 weight percent, or in some cases upto 4 weight percent, or in some cases 3 weight percent with the weight percent being considered based on the total weight of the composition
  • the anti-corrosive composition comprises about 0.1 to 1 weight percent of the drier combination based on the total weight of the composition.
  • the composition of the present invention comprises a wetting and dispersing agent.
  • the dispersing agent is a solution of a salt of unsaturated polyamine amides and lower molecular weight acidic polyesters. It acts as a dispersing agent which helps in dispersing the fillers in the total system homogenously. This is the primary role of the dispersing agent which is to enhance the dispersion process and ensure a fine particle size in order to stabilize pigments in the binder solution.
  • the wetting and dispersing additive is AntiTera U/Byk 9056.
  • the dispersing agent is present in the composition of the present invention in an amount of upto 5 weight percent, or in some cases upto 4 weight percent, or in some cases 3 weight percent with the weight percent being considered based on the total weight of the composition.
  • the anti-corrosive composition comprises about 0.1 to 5 weight percent of the dispersing agent based on the total weight of the composition.
  • the wetting step consists of replacing the adsorbed materials on the surface of the pigment/filler and inside the agglomerates (water, oxygen, air) by the binder solution.
  • Inorganic fillers are solids that are present in a finely divided form in the composition. Fillers have two tasks; on the one hand they are to bring down the cost of a product in the conventional sense and ensure that, in comparison with products that are not filled, it has improved or additional properties like hiding strength, coverage etc.
  • suitable inorganic fillers are finely divided calcium carbonates (e.g.
  • the most preferred fillers employed in the present composition include calcium carbonate, black oxide and talc. Preferably each of these individual fillers are employed in the composition in the range of about 2-5 weight percent based on the total weight of the composition.
  • Calcium carbonate employed as filler in the current composition increases the hiding power of the coating and gives mass to the total system, whereas talc helps to promote the anti-corrosive property of the system.
  • Black oxide imparts color and UV resistance properties.
  • the amount of filler in the composition is about 2 percent by weight or greater and more preferably 5 percent by weight or greater.
  • amount of filler in the composition is about 1 to 10 weight percent based on the total weight of the composition to achieve the desired workability of the composition.
  • rheological modifiers may be added to control the flow properties of the final product for a particular application.
  • the rheological modifier utilized in the improved coating composition of the present invention advantageously performs the functions of both an anti-sag additive as well as a flow control agent.
  • the rheological additive of the present invention improves the sag resistance of a coating composition. Following application on a surface, the coating must maintain sufficient viscosity during the drying process to prevent unsightly runs and drips until the coating is dry.
  • the most preferred rheological modifier/additive employed in context of the present invention is Aerosil. Aerosil that is used in the present composition helps to build thixotropicity in the system and also stabilizes the total system, preventing settling and agglomeration.
  • the amount of rheological modifier additive in the composition is about 1-5 percent by weight and more preferably 2 percent by weight or greater.
  • the amount of filler in the composition is about 1 to 10 weight percent based on the total weight of the composition to achieve the desired workability of the composition.
  • the composition of the present invention comprises rubber. Rubber helps to provide better sound damping properties, helps in creating the texture to be in compliance with market standards, and also acts as a filler to some extent.
  • the amount of rubber in the composition is about 1-10 percent by weight and more preferably about 7 percent by weight or lesser and most preferably about 0.1 to 2 percent by weight based on the total weight of the composition.
  • Exemplary solvents/diluents include but are not limited to xylene, toluene, butyl acetate, acetone, methyl ethyl ketone, methyl isobutyl ketone, alcohols such as methanol, ethanol, propanol, butanol, diacetone alcohol or other aromatic hydrocarbon solvents, alcohols or mixtures thereof.
  • Most preferred solvents in context of the present invention include, but are not limited to xylene, toluene and diacetone alcohol.
  • the solvent is used to offer coatability and adhesion property.
  • toluene is employed as a solvent so as to afford faster drying and to optimize the drying time whereas Xylene as a solvent enables slower drying when compared to toluene and also prevents choking of the spray gun tip.
  • Di acetone alcohol is mainly employed to adjust polarity for the aerosil to be functional.
  • the solvent is present in an amount, based on the total weight of the composition, of from 20 to 80 weight %, more preferably from 40 to 60% and most preferably about 50%.
  • the coating compositions are conventionally applied onto substrates, in particular metal substrates, such as vehicle bodies, which have optionally been pre-coated e.g. with a primer.
  • substrates in particular metal substrates, such as vehicle bodies, which have optionally been pre-coated e.g. with a primer.
  • metal substrates such as vehicle bodies
  • a primer optionally been pre-coated e.g. with a primer.
  • These in particular comprise metals as are used for the production of vehicle bodies such as steel.
  • the present invention provides an improved underbody coating compositions which may be easily applied by conventional spraying systems.
  • Other modes of application are roller coating, brushing, sprinkling, flow coating, dipping, electrostatic spraying and the like.
  • compositions of the present invention can be applied to a substrate to be treated by conventional coating techniques such as, for example, spray coating, brush coating, dip coating, direct roll coating, reverse roll coating, curtain coating, and combinations thereof, among other methods.
  • coating techniques such as, for example, spray coating, brush coating, dip coating, direct roll coating, reverse roll coating, curtain coating, and combinations thereof, among other methods.
  • compositions of the present invention are applied by a paint spray gun.
  • compositions of the present invention may be applied as a single coating, for example, as a topcoat as a basecoat in a two-coat composition; or as a layer of a multi-component coating, for example, as a primer layer, basecoat and/or topcoat layer.
  • Compositions of this invention are useful, for example, as a primer, a basecoat and/or a topcoat, applied either directly onto the substrate surface itself or disposed onto prior underlying coating(s) and/or treatment(s), e.g., an inorganic or organic treatment, a primer, and/or basecoat material, disposed on the substrate surface to achieve a desired result.
  • the underbody coating composition comprises at least
  • the instant compositions may optionally contain effective amounts of known additives, including but not limited to: corrosion inhibitors, dyes, curing agents, fragrances, ultraviolet light absorbers; antifoaming agents: antistatic agents; thickening agents (e.g., xanthan gum, cellulose, methylcellulose, pectin and the like).
  • additives including but not limited to: corrosion inhibitors, dyes, curing agents, fragrances, ultraviolet light absorbers; antifoaming agents: antistatic agents; thickening agents (e.g., xanthan gum, cellulose, methylcellulose, pectin and the like).
  • the oil resistance of coatings is tested by partial or complete immersion of coated test specimens in oil at elevated temperatures. Subsequently, the test metal panel is checked for softening, blistering or peeling of the coating composition.
  • the water resistance of coatings is tested by partial or complete immersion of coated test specimens in distilled or de-mineralized water at elevated temperatures.
  • the apparatus and procedure could be employed in immersion tests using solutions of various materials in water, this practice is limited to tests in water alone.
  • Coated specimens are partially or wholly immersed in water in a container that is resistant to corrosion.
  • the exposure conditions are varied by selecting (a) the temperature of the water and (b) the duration of the test. Water permeates the coating at rates that are dependant upon the characteristics of the coating and upon the temperature of the water. Any effects such as color change, blistering, loss of adhesion, softening or embrittlement are observed and reported.
  • the impact resistance of the test panel is tested by dropping a load of 500 gm wt, of 0.5 inch diameter from a height of 500mm, on the metal test panel coated with the coating composition of the present invention.
  • Corrosion resistance test is conducted on a metal test panel and a coating of the composition prepared in accordance with the current invention. More specifically the corrosion resistance test is the salt spray test.
  • the salt spray test is a standardized test method used to check corrosion resistance of coated samples. The appearance of corrosion products is evaluated after a period of time. Test duration depends on the corrosion resistance of the coating; the more corrosion resistant the coating is, longer the period in testing without showing signs of corrosion.
  • this test method covers the treatment of previously painted or coated specimens for accelerated and atmospheric exposure tests and their subsequent evaluation in respect to corrosion, blistering associated with corrosion, loss of adhesion at a scribe mark, or other film failure.
  • This method therefore provides a means of evaluating and comparing basic corrosion performance of a substrate, pretreatment or coating system or combination thereof, after exposure to corrosive environments.
  • composition of the present invention is subjected to a diesel resistance test to assess the diesel resistance of the coating composition.
  • Example 1 illustrates embodiments of the underbody coating composition of the present invention.
  • Formulation 1 tabulated in table 1 is an embodiment of coating composition of the present invention.
  • the underbody coating composition was prepared in accordance to the tabulated components in Table 1.
  • the whole composition was prepared under mechanical stirring, at room temperature of 25° C. to 30° C.
  • the RPM was adjusted during the mixing stage, and after addition of all the ingredients was stirred at high speed of 3500 RPM for 3-5 minutes for complete dispersion of the fillers and attainment of the desired thixotropy.
  • Both the rubber 13 a and b were taken in required proportion and mixed in a two roll mill thoroughly at room temperature to make a homogenous mixture.
  • the weighed amount of mixed rubber (13 a and b) was dissolved in weighed amount of toluene (12) for complete swelling and kept immersed for 12 hours.
  • the swelled rubber was subsequently stirred at 1000-1500 rpm to make a paste.
  • Weighed amount of solvent (10 & 11) were taken in the mixing vessel.
  • Required amount of resin A(1) and B(2) was weighed.
  • the resin was added to the solvent slowly under continuous stirring at 500-1000rpm, for 10-15 min. Subsequently the speed was increased to 1500-2000 rpm to ensure full dissolution.
  • Dispersing agent (5) was added to the stirring solution.
  • the coating composition prepared in accordance to the current invention were applied at uniform thickness to test metal panels and were subjected to 3 hour immersion in gear oil for 3 hours at 50° C.
  • the composition exhibited good resistance to oil as the test metal panel coated with the composition of the present invention was free from softening, blistering and peeling off.
  • Boiling Water Resistance Test The coating composition prepared in accordance to the current invention were applied at uniform thickness to test metal panels and the tank was filled with water to a depth such that the test specimens were immersed approximately three quarters of their length. The test panels were subjected to 30 minutes immersion of coated panel in boiling water. The composition exhibited good resistance to water as the test metal panel coated with the composition of the present invention was free from softening, blistering and peeling off.
  • the coating composition prepared in accordance to the current invention were applied at uniform thickness to test metal panels and subjected to drop impact test of 500 gm weight, of 0.5 inch diameter from a height of 500 mm, on the reverse side of the panel.
  • the composition of the present invention was free from peeling off.
  • the coating composition prepared in accordance to the current invention were applied at uniform thickness to test metal panels and subjected to 80° C. for 6 days and then at ⁇ 40° C. for 2 days, subsequently at 55° C. and 95% RH for days and again at ⁇ 40° C. for 2 days and 80° C. for 3 days.
  • the panel was checked for wear resistance after the treatment.
  • the composition of the present invention passed 18 kg of nut drop resistance after the cycle.
  • the test was performed in an apparatus for testing consisting a closed testing chamber, where a salted solution (mainly, a solution of sodium chloride) was atomized by means of a nozzle. This produces a corrosive environment of dense saline fog in the chamber such that the metal parts exposed were attacked under accelerated corroding atmosphere.
  • a salted solution mainly, a solution of sodium chloride
  • the metal test piece uniformly coated with the composition of the present invention was exposed to standardized 5% solution of NaCl known as NSS (neutral salt spray). The results are represented as testing hours in NSS without appearance of corrosion products. The current invention is tested to pass 600 hrs of Salt Spray Test.
  • NSS neutral salt spray
  • the coating composition prepared in accordance to the current invention were applied at uniform thickness to test metal panels and the wear resistance of the coating composition was checked by dropping a 3mm hexagonal brass nut dropped from a height of 2 metres at an angle of 45° C.
  • the test panel coated with the composition of the present invention passed 21 kgs of nuts dropped which is far superior to the currently marketed products which fail at this test at merely 2-5 kgs.
  • a pictoral representation of the wear resistance exhibited by the present composition is shown in FIG. 1 .
  • the damping properties of the present composition is checked in a panel of size 7.5 cm*150 cm, by using Impact hammer
  • the damping co-efficient was found to be 0.06-0.08 at a coating thickness of 450 micron.
  • the coating composition prepared in accordance to the current invention was applied at uniform thickness to test metal panels and were subjected to 12 hour immersion in diesel.
  • the composition exhibited good resistance to diesel as the test metal panel coated with the composition of the present invention was free from softening, blistering and peeling off.
  • most of the currently marketed products show softening of the coating in contact with Diesel. If prolonged for 15 min, the whole of coating is dissolved from the competitors test panel. (As provided in FIG. 6 )
  • the procedure comprises for assessing the adhesion of coating films to metallic substrates by applying and removing pressure-sensitive tape over cuts made in the film.
  • the coating composition prepared in accordance to the current invention were applied at uniform thickness to test metal panels and were subjected to 1mm cross hatch test. No peeling off was observed.
  • Table 2 tabulates the comparative performance of the coating composition of the present invention vis-à-vis the marketed product.

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IN3666CH2011 2011-10-25
PCT/US2012/061778 WO2013063184A1 (en) 2011-10-25 2012-10-25 Corrosion, chip and fuel resistant coating composition

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JP (1) JP2014530954A (enrdf_load_stackoverflow)
CN (1) CN103987799B (enrdf_load_stackoverflow)
AU (1) AU2012328817B2 (enrdf_load_stackoverflow)
BR (1) BR112014009942A2 (enrdf_load_stackoverflow)
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Cited By (7)

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US9249255B2 (en) * 2012-03-20 2016-02-02 Blue Cube Ip Llc Modified epoxy resin composition used in high solids coating
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US20170226370A1 (en) * 2014-08-20 2017-08-10 Evonik Roehm Gmbh Reactive resin sealing for low-contaminant cold plastic markings
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US20220135829A1 (en) * 2019-02-28 2022-05-05 Topchim Nv Polymeric coating formulation with hydrophobic side chains
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CN113441076A (zh) * 2021-06-18 2021-09-28 上海正宏农牧机械设备有限公司 Tmr搅拌机物料接触面处理工艺
CN115404011A (zh) * 2022-10-31 2022-11-29 四川省众望科希盟科技有限公司 飞机盒段与膨化聚四氟乙烯在介质环境下的粘接方法

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CN103987799B (zh) 2017-10-31
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